| 单词 | tri-fin | 
| 释义 | > as lemmastri-fin   tri-fin  n. and adj.  Brit. , U.S. Surfing and Windsurfing 		 (a) n. a surfboard or sailboard with three fins (fin n.1 Additions);		 (b) adj. (of a surfboard or sailboard) having three fins. ΚΠ 1971    Surfer Aug. 46  				The tri-fin..has single-fin drive and twin-fin torque. 1972    Press-Telegram 		(Long Beach, Calif.)	 28 Apr.  c5/7 		(advt.)	  				Surfboards. Tri-fin $40. Twin-fin $10. 2009    Cornish Guardian 		(Nexis)	 16 Sept. 4  				Four surfboards stolen. The boards are a Rusty, 5ft 10in tri fin surfboard, a Rusty 6ft 1in tri fin board [etc.]. 2014    Sydney Morning Herald 		(Nexis)	 7 Jan. 30  				Fins keep surfboards in the wave face but the Thruster, or tri-fin, may have had the greatest effect on surfing dynamics. < as lemmas | 
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